作者：Joshi Rohit 2 年以前
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A bone break, a cut, or blister all require new cells to close the gaps.
Your body also replaces each red blood cell every 120 days
Each day your body sheds millions of dead skin cells
Replaced by new ones
The movement of these chemicals are caused by diffusion
Concentration is the amount of solute (substance) in a given volume of solution
Osmosis is how water enters and leaves the cell
All organisms grow. As multicellular organisms grow, the number of cells increases
The size of each cell does not increase because of how a cell uses chemicals to function
Cells require: Energy, nutrients, water, and gases
Must also be able to excrete carbon dioxide and other waste products.
All cells use cell division to reproduce. Each time a parent cell divides, it results in two new organisms.
Multicellular organisms also need to reproduce and pas their genetic information along to their offspring. (Some multicellular organisms can produce offspring by asexual reproduction.)
Sexual reproduction in which a cell from one parent joins with the cell from another parent. These two parental cells are different from normal body cells: as they contain half of the DNA found in a cell.
Cells know as gametes undergo additional cell division prosses such as meiosis. (When two gametes combine.)
Offspring will inherit characteristics from both parents.
Each organisms inherits genetic information from its parent. It's important that each new cell has a complete set of genetic information
Asexual reproduction involves only one parent. The offspring are exact genetic copies of the parent.
Plasmodesmata
Lysosome
Cell membrane only No cell wall
Cytoskeleton
Multiple small vacuoles
Centrosomes
Mitochondrion Cell Membrane Nucleolus Nucleus Endoplasmic reticulum Golgi apparatus Vesicles Vacuoles Cytoplasm Nuclear Membrane Chromatin Smooth ER Rough ER Ribosomes
Chloroplast
Large vacuole
Cell wall
